Simple and facile synthesis of pure nanocrystalline spinel cobaltite by thermal decomposition of solid solution precursors

Packiaraj, S.; Jeyaraj, M.; Chandarasekaran, K.; Rawson, Jeremy M.; Govindarajan, S.

doi:10.1007/s10854-019-02243-7

Cited by 14 publications

(3 citation statements)

References 44 publications

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“…DRIFTS studies were used for investigating NO@Co 2 (DOBDC) for the first time (Figure 8) to demonstrate that NO coordinated to the metal centers can be efficiently released and replaced with water molecules. Figures 8 and S11 show the disappearance of the 1798 cm −1 stretching frequency corresponding to coordinated NO molecules and the simultaneous growth of a broad band at 3421 cm −1 corresponding to the presence of coordinated water molecules to the metal site [74, 75] . Coordination of NO to the metal site is also associated with a visible color change of the material from brown (parent MOF) to black.…”

Section: Resultsmentioning

confidence: 98%

A Metal‐Organic Framework (MOF)‐Based Multifunctional Cargo Vehicle for Reactive‐Gas Delivery and Catalysis

et al. 2022

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The efficient delivery of reactive and toxic gaseous reagents to organic reactions was studied using metal‐organic frameworks (MOFs). The simultaneous cargo vehicle and catalytic capabilities of several MOFs were probed for the first time using the examples of aromatization, aminocarbonylation, and carbonylative Suzuki–Miyaura coupling reactions. These reactions highlight that MOFs can serve a dual role as a gas cargo vehicle and a catalyst, leading to product formation with yields similar to reactions employing pure gases. Furthermore, the MOFs can be recycled without sacrificing product yield, while simultaneously maintaining crystallinity. The reported findings were supported crystallographically and spectroscopically (e.g., diffuse reflectance infrared Fourier transform spectroscopy), foreshadowing a pathway for the development of multifunctional MOF‐based reagent‐catalyst cargo vessels for reactive gas reagents as an attractive alternative to the use of toxic pure gases or gas generators.

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Section: Resultsmentioning

confidence: 98%

A Metal‐Organic Framework (MOF)‐Based Multifunctional Cargo Vehicle for Reactive‐Gas Delivery and Catalysis

et al. 2022

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“…Figures 8 and S11 show the disappearance of the 1798 cm À 1 stretching frequency corresponding to coordinated NO molecules and the simultaneous growth of a broad band at 3421 cm À 1 corresponding to the presence of coordinated water molecules to the metal site. [74,75] Coordination of NO to the metal site is also associated with a visible color change of the material from brown (parent MOF) to black. This visible change corresponds to changes in the DR spectrum of Co 2 (DOBDC) in the visible region after exposure to NO gas from two electronic transitions with λ max = 580 and 720 nm to three electronic transitions with λ max = 520, 600, and 700 nm (Figure S12).…”

Section: Resultsmentioning

confidence: 99%

A Metal‐Organic Framework (MOF)‐Based Multifunctional Cargo Vehicle for Reactive‐Gas Delivery and Catalysis

et al. 2022

View full text Add to dashboard Cite

The efficient delivery of reactive and toxic gaseous reagents to organic reactions was studied using metal-organic frameworks (MOFs). The simultaneous cargo vehicle and catalytic capabilities of several MOFs were probed for the first time using the examples of aromatization, aminocarbonylation, and carbonylative Suzuki-Miyaura coupling reactions. These reactions highlight that MOFs can serve a dual role as a gas cargo vehicle and a catalyst, leading to product formation with yields similar to reactions employing pure gases. Furthermore, the MOFs can be recycled without sacrificing product yield, while simultaneously maintaining crystallinity. The reported findings were supported crystallographically and spectroscopically (e.g., diffuse reflectance infrared Fourier transform spectroscopy), foreshadowing a pathway for the development of multifunctional MOF-based reagent-catalyst cargo vessels for reactive gas reagents as an attractive alternative to the use of toxic pure gases or gas generators.

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“…An easy and convenient reaction route for the preparation of the simple and mixed nanosized transition metal oxides [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]-especially for the synthesis of catalytically active spinel oxides [19][20][21][22][23][24][25][26][27][28][29][30]-is the thermal decomposition of complexes having reducing ligands and oxidizing anions [31][32][33][34][35][36][37][38]. These processes consisted of a solid-phase quasiintramolecular redox reaction between an oxidizing anion and a reducing ligand.…”

Section: Introductionmentioning

confidence: 99%

Insight into the Structure and Redox Chemistry of [Carbonatotetraamminecobalt(III)] Permanganate and Its Monohydrate as Co-Mn-Oxide Catalyst Precursors of the Fischer-Tropsch Synthesis

Béres,

Dürvanger,

Homonnay

et al. 2024

Inorganics

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[Carbonatotetraamminecobalt(III)] permanganate monohydrate was synthesized first in the metathesis reaction of [Co(NH3)4CO3]NO3 and NaMnO4 in aqueous solution. Its thermal dehydration at 100 °C resulted in phase-pure [Co(NH3)4CO3]MnO4 (compound 1). Compounds 1 and 2 (i.e., the hydrated form) were studied with IR, far-IR, and low-temperature Raman spectroscopies, and their vibrational modes were assigned. The lattice parameters were determined by powder X-ray diffraction (PXRD) and single crystal X-ray diffraction (SXRD) methods for the triclinic and orthorhombic compounds 1 and 2, respectively. The detailed structure of compound 2 was determined, and the role of hydrogen bonds in the structural motifs was clarified. UV studies on compounds 1 and 2 showed the distortion of the octahedral geometry of the complex cation during dehydration because of the partial loss of the hydrogen bonds between the crystal water and the ligands of the complex cation. The thermal decomposition consists of a solid phase quasi-intramolecular redox reaction between the ammonia ligands and permanganate anions with the formation of ammonia oxidation products (H2O, NO, N2O, and CO2). The solid phase reaction product is amorphous cobalt manganese oxide containing ammonium, carbonate (and nitrate) anions. The temperature-controlled thermal decomposition of compound 2 in toluene at 110 °C showed that one of the decomposition intermediates is ammonium nitrate. The decomposition intermediates are transformed into Co1.5Mn1.5O4 spinel with MnCo2O4 structure upon further heating. Solid compound 2 gave the spinel at 500 °C both in an inert and air atmosphere, whereas the sample pre-treated in toluene at 110 °C without and with the removal of ammonium nitrate by aqueous washing, gave the spinel already at 300 and 400 °C, respectively. The molten NH4NO3 is a medium to start spinel crystallization, but its decomposition stops further crystal growth of the spinel phase. By this procedure, the particle size of the spinel product as low as ~4.0 nm could be achieved for the treatments at 300 and 400 °C, and it increased only to 5.7 nm at 500 °C. The nano-sized mixed cobalt manganese oxides are potential candidates as Fischer-Tropsch catalysts.

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Simple and facile synthesis of pure nanocrystalline spinel cobaltite by thermal decomposition of solid solution precursors

Cited by 14 publications

References 44 publications

A Metal‐Organic Framework (MOF)‐Based Multifunctional Cargo Vehicle for Reactive‐Gas Delivery and Catalysis

A Metal‐Organic Framework (MOF)‐Based Multifunctional Cargo Vehicle for Reactive‐Gas Delivery and Catalysis

A Metal‐Organic Framework (MOF)‐Based Multifunctional Cargo Vehicle for Reactive‐Gas Delivery and Catalysis

Insight into the Structure and Redox Chemistry of [Carbonatotetraamminecobalt(III)] Permanganate and Its Monohydrate as Co-Mn-Oxide Catalyst Precursors of the Fischer-Tropsch Synthesis

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